$\"\"$ $\"\"$

The equation is “ $\"\"$ ”

According to addition property of equality: if $\"\"$ then $\"\"$

$\"\"$ (Add 3 to each side)

$\"\"$ (Additive inverse property: $\"\"$ )

$\"\"$ (Additive identity property: $\"\"$ )

$\"\"$ (Add: $\"\"$ ) $\"\"$

The value of x is 13.